A new Steam update has been released all you have to do is to reload Steam and it will update.

Changelog:

- Fixed "Cache read error" some user are experiencing
- Steam now checks for invalid CD keys immediately on game launch
- Optimized content server load balancing
- Change banner to always show the most recently connected content server
- Fixed "No config servers online" state error
- Steam now handles siultaneously logging in to multiple machines better
- Fixed forced disconnections happening too often - this will now only happen if Steam's filesystem is lost
- Fixed several cases where the 'ticket has expired' error could occur without displaying the refresh login dialog
- Fixed all cases of the #Steam_Roo missing string problem
- Added support for ATI "Rebate" product keys